Justine Sacco blew up Twitter with this tweet.

Justine Sacco, former PR executive for IAC, tweeted a fairly insensitive joke right before boarding an international flight to Africa. While she was in the air and offline, the tweet spread like wildfire and she was dismissed from her post as a result.

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Don't tweet bad things about your potential employer

Connor Riley had a job offer from Cisco on the table. She tweeted: “Cisco just offered me a job! Now I have to weigh the utility of a fatty paycheck against the daily commute to San Jose and hating the work.”

Shortly after that, there was a reply from Cisco employee Tim Levad: “Who is the hiring manager? I’m sure they would love to know that you will hate the work. We here at Cisco are versed in the Web.”